JPH1050504A - Variable resistor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a variable resistor, using a relatively inexpensive facility by forming a slider out of a single resilient wire. SOLUTION: A slider 1 is secured to the bottom of a knob 2, while touching a pattern printed 3a and fired on a ceramic board 3 resiliently. When the knob 2 is turned, the slider 1 slides on the printed pattern 3a, to provide a predetermined resistance. The slider 1 is formed by bending a single resilient wire, such that the longitudinal direction thereof matches with the sliding direction. The part 1a touching the print pattern 3a on the ceramic board 3 is provided with resiliency, by bending into U-shape larger than the diameter of the wire so that the slider 1 can be turned by turning the knob 2 smoothly. According to the arrangement, a large-scale punching facility or die is not required, and the production process of the slider 1 can be incorporated into the rationalized facility for flyback transformer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable resistor used for, for example, a flyback transformer for extracting a focus voltage or a screen voltage, and more particularly to a structure of a slider for the variable resistor.

[0002]

2. Description of the Related Art By rotating a knob, a slider provided integrally with the knob is rotated, and the printed pattern on the ceramic substrate is relatively slid with the slider to thereby obtain a predetermined resistance value. In the variable resistor to be obtained, a conventional slider is formed by punching a metal plate having a spring property and then performing a bending process.

[0003]

Conventionally, as described above, since the slider is formed by punching a metal plate, large-scale equipment for punching and an expensive die are required. There is a problem that the cost of the variable resistor including the slider is high.

[0004] It is an object of the present invention to overcome such disadvantages of the prior art and to provide a variable resistor manufactured with relatively inexpensive equipment.

[0005]

The object of the present invention is to rotate a slider to rotate a slider integrally provided with the knob, thereby relatively moving the slider with a printed pattern on an insulating substrate such as ceramic. In a variable resistor that obtains a specified resistance value by sliding, the slider is achieved by a first means formed of a single wire having a spring property.

In the first means, the slider is
It is bent in the same direction as the sliding direction, and the contact portion with the print pattern is bent in an arc shape larger than the diameter of the wire.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a variable resistor for a flyback transformer incorporating a slider according to a first embodiment of the present invention, FIG. 2 is a side view of the variable resistor in an assembled state, and FIG. FIG. 3 is a plan view showing a relationship between a slider of the variable resistor and a ceramic substrate.

The slider 1 is fixed to the bottom of the knob 2,
It is in elastic contact with a printing pattern (resistance pattern) 3 a printed and fired on a ceramic substrate (resistance printing substrate) 3. By turning the knob 2, the slider 1 becomes the print pattern 3.
A predetermined resistance value is obtained by sliding on a.

The slider 1 of the present invention is different from the conventional one formed by punching a metal plate, in that one wire having a spring property has a sliding direction equal to the length direction of the wire. The pattern contact portion 1a of the ceramic substrate 3 with the printed pattern 3a is bent to an arc (U shape) larger than the diameter of the wire so as to have a spring property. The configuration is such that the slider 1 can be rotated in the same manner.

With such a structure, it is possible to incorporate the manufacturing process of the slider 1 into a part of the facility for streamlining the flyback transformer without requiring large-scale equipment and a die for punching. Become.

FIG. 4 is a perspective view of a slider according to a second embodiment. As shown in the figure, the slider 1 has a pattern contact portion 1a formed by bending both ends of a linear portion 1b of a wire in the same direction and bending a pair of arcs in front of the both ends.

FIG. 5 is a perspective view of a slider according to a third embodiment. As shown in the figure, the slider 1 has a pattern contact portion 1a formed by bending both ends of a linear portion 1b of a wire in the opposite direction and bending a pair of arcs in front of the both ends.

FIG. 6 is a perspective view of a slider according to a fourth embodiment. As shown in the drawing, the slider 1 has both ends of a linear portion 1b of a wire bent at an acute angle, and a pair of arc-shaped pattern contact portions 1a formed at the distal end thereof.

FIG. 7 is a perspective view of a slider according to a fifth embodiment. As shown in the drawing, the slider 1 has a pair of arc-shaped pattern contact portions 1a at both ends of a curved portion 1c of a wire.

In each of these embodiments, the same effect as in the first embodiment shown in FIGS. 1 to 3 can be obtained.

In the above embodiment, the variable resistor for a flyback transformer has been described. However, the present invention can be applied to a variable resistor for other uses.

[0017]

As described above, according to the present invention,
The slider can be simplified, and the variable resistor can be manufactured with relatively inexpensive equipment.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a flyback transformer variable resistor incorporating a slider according to a first embodiment of the present invention.

FIG. 2 is a side view in an assembled state of the flyback transformer variable resistor.

FIG. 3 is a plan view of a slider and a ceramic substrate of the variable resistor for the flyback transformer.

FIG. 4 is a perspective view of a slider according to a second embodiment of the present invention.

FIG. 5 is a perspective view of a slider according to a third embodiment of the present invention.

FIG. 6 is a perspective view of a slider according to a fourth embodiment of the present invention.

FIG. 7 is a perspective view of a slider according to a fifth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Slider 1a Pattern contact part of slider 2 Knob 3 Ceramic substrate 3a Print pattern

Claims (2)

[Claims] 1. A predetermined resistance value is obtained by rotating a knob to rotate a slider provided integrally with the knob, and by relatively sliding the printed pattern on the insulating substrate and the slider. In the variable resistor, the slider is formed of a single wire having a spring property. 2. The device according to claim 1, wherein the slider is
A variable resistor, which is bent in the same direction as the sliding direction, and a portion in contact with the printing pattern is bent in an arc shape larger than the diameter of the wire.